Yes, call 911! She needed medical attention. Sometimes in this situation people think that others are calling and then no one calls. This is called the bystandar effect. Was she in the crosswalk? The irony is that Farragut West has “Pedestrian Safety” signs up stating tha DC police is doing random checks on pedestrians to ensure their safety.
This doesn’t apply to this situation, but it is good to know. During first aid training they teach you to look directly as someone and say “You–Call 911.” Then the person is more likely to respond than just saying “someone call 911”.